Identifying fossil fault activity along the eastern Periadriatic Fault system by means of combined OSL- and ESR-dating of fault gouges (NE Italy, S Austria and N Slovenia)

通过断层泥的 OSL 和 ESR 联合测年（意大利东北部、奥地利南部和斯洛文尼亚北部）来识别沿东部近海断层系统的化石断层活动

• 批准号: 442590718
• 负责人: Professorin Dr. Sumiko Tsukamoto
• 金额: --
• 依托单位: Sektion 3: Geochronologie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/442590718?language=en
• 关键词: Identifying; fossil; fault; activity; along

We intend to investigate the eastern Periadriatic Fault system at the transition from the Eastern to the Southern Alps by means of combined optically stimulated luminescence (OSL) of feldspar and electron spin resonance (ESR) dating of quartz from fault gouges. The Periadriatic Fault (PAF) system can be traced along-strike the entire Alps and is one of its tectonically and geomorphologically most important features. It has accommodated between 150 and 300 km right lateral strike-slip motion between the European and the Adriatic plates since about 35 Ma. The eastern PAF system reveals relatively little instrumental seismic activity, particularly when compared to the southerly adjacent Southern Alps and northern Dinarides in Friuli and northwestern Slovenia. However, it has likely hosted strong historical earthquakes, such as the Mw 7.1 event in 1348 and the Mw 6.5 event in 1690, with epicentres in Carinthia (southern Austria). GPS data suggest that the eastern PAF system still accommodates parts of the Adria-Europe convergence. Building on the fact that the intensity of the OSL and ESR signals in quartz and feldspar can become partially reset by frictional heating during seismogenic faulting, we intend to better constrain the timing of past seismic events by investigating natural fault gouges along the eastern PAF system. This approach will help to unravel which of these faults have been seismically active throughout the Quaternary.

我们打算通过Feldspar的光学刺激发光（OSL）和电子旋转共振（ESR）的晶状体（ESR）在断层g剂中的光学刺激发光（OSL）的结合来研究从东阿尔卑斯山到南阿尔卑斯山的过渡。周围的断层（PAF）系统可以沿整个阿尔卑斯山追溯，并且是其构造和地貌最重要的特征之一。自大约35 mA以来，它已经容纳了欧洲和亚得利亚板之间的150至300公里之间的150至300公里。东部PAF系统揭示了相对较少的仪表抗性活动，尤其是与弗里利（Friuli）和斯洛文尼亚西北部的南部阿尔卑斯山和北部的Dinarides相比，相比之下。但是，它很可能会举办强烈的历史地震，例如1348年的MW 7.1事件和1690年的MW 6.5事件，在卡林西亚（南奥地利）的Epcentres。 GPS数据表明，东部PAF系统仍然容纳Adria-Europe收敛的一部分。基于这一事实，即石英和长石中OSL和ESR信号的强度可以通过在地震发生断层期间的摩擦加热来部分重置，我们打算通过研究东部PAF系统沿线的自然断层gouges来更好地限制过去的地震事件的时间。这种方法将有助于揭示整个第四纪的这些断层中的哪些断层。